Final answer:
A food chain describes the linear feeding relationships in an ecosystem, showing how energy and nutrients are transferred from one organism to another.
Step-by-step explanation:
A food chain describes the feeding relationships from one organism to the next in a linear path. It shows the transfer of energy and nutrients as organisms consume each other. For example, a simple food chain in a grassland ecosystem can be grass → grasshopper → frog → snake → hawk, with each organism feeding on the one below it.
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